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Changes for version 3.15

The Cwd::getcwd() function on *nix is now a direct pass-through to the underlying getcwd() C library function when possible. This is safer and faster than the previous implementation, which just did abs_path('.'). The pure-perl version has been kept for cases in which the XS version can't load, such as when running under miniperl. [Suggested by Nick Ing-Simmons]

When Cwd searches for a 'pwd' executable in the $PATH, we now stop after we find the first one rather than continuing the search. We also avoid the $PATH search altogether when a 'pwd' was already found in a well-known and well-trusted location like /bin or /usr/bin. [Suggested by Nick Ing-Simmons]

On Win32 abs2rel($path, $base) was failing whenever $base is the root of a volume (such as C:\ or \\share\dir). This has been fixed. [Reported by Bryan Daimler]